Spin polarized current from multiply-coupled rings with Zeeman-split quantum dots
Spin polarized current from multiply-coupled rings with Zeeman-split quantum dots
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DOI：
10.1063/1.4868545
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发表时间：
2014-03
影响因子：
3.2
通讯作者：
E. Hedin;Y. S. Joe
中科院分区：
文献类型：
--
作者：
E. Hedin;Y. S. Joe
我们研究了多个，串联连接，直接接触的纳米环使用紧束缚模型的传输共振和电导特性。量子点（QD）嵌入在每个环的两个臂中，并且QD能级的塞曼分裂被并入系统哈密顿量中。随着环的串联数目的增加，透射带发展，带隙对塞曼分裂的程度和QD位点能量值的初始设置敏感。系统的电流-电压特性可以作为塞曼分裂的函数在欧姆和半导体之间调制。此外，自旋极化电流的费米能量的选定范围的结果。
We investigate transmission resonances and conductance properties of multiple, serially connected, direct-contact nanoscale rings using the tight-binding model. Quantum dots (QDs) are embedded in the two arms of each ring, and Zeeman-splitting of the QD energy levels is incorporated into the system Hamiltonian. Transmission bands develop as the number of rings in series increases, with a band-gap which is sensitive to the degree of Zeeman splitting and the initial settings of the QD site energy values. The current vs. voltage characteristics of the system can be modulated between Ohmic and semiconducting as a function of the Zeeman splitting. In addition, spin-polarized current results for selected ranges of the Fermi energy.